Allow BiBiGrid configuration to affect slurm configuration

Using key-slurmConf's subkey elastic_scheduling one can now set SuspendTime, ResumeTimeout and TreeWidth.

For example:

  slurmConf:
    elastic_scheduling:
      SuspendTime: -1 # never suspend

Default values: "elastic_scheduling": {"SuspendTime": 3600, "ResumeTimeout": 900, "TreeWidth": 128}

Closes #51 (closed)